Default jQuery UI lacks widgets I want to use. How to implement.

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Concrete5 5.6 ships with (out of date) jQuery Ui in which the collection of widgets is incomplete. Not included are menu, tabs and tooltips - all of which I want to use.

I downloaded my own version of jQuery UI with the widgets I need and they work. However if I want to edit anything there is a conflict between my jQUI and C5's and not a lot works - particularly the edit bar, at the top, which is blank. If I remove my version it works again.

I tried loading the C5 version in my header and calling the missing bits after. Not a success.

I tried putting a full version with all widgets in the js folder - which I hoped would work as an override. No success there either.

Anyone got any ideas for a work round ?
And why wasn't the whole jQuery UI script included in the default package ?

I'd like to try jQuery Mobile - but the version of jQuery shipped with C5 is unlikely to support it.